Definitely go Two level "topper"...build for Future...you won't regret later!!!
Agreed for several reasons.
One prominent is that it’s easy to attach a backing (Masonite) and keep household walls away from damage
That same backing can extend below desktop to accommodate what shelving or cable runs may be placed there.
There is eventually a reason to pull any furniture away from the wall. Shelf-backer makes it a clean proposition.
I’ve brought this up before (for anyone):
I prefer cantilevered desks/work benches. Sturdier, use less space with more tabletop, and any sort of shelving can be done. Change shelves at will if free-standing.
A good example with great pics: (not a link)
Instructables: Simple, Rock-Solid Cantilever Desk in Ten Steps.
Have done several over the years, house & garage (more HD than shown; easy to reinforce). Rebuilt a big block on one of them.
Backing against wall on furring strips can be all sorts of types behind moveable shelf units. Easy to build power and coax runs. Ground system below. Etc.
And
No table legs to constantly be in the way. No impediments to cleaning floor. Roll your chair anywhere.
The surprisingly few holes into walls (studs) make it an easy conversion back to original.
.